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Coulson Eacsvating Company, Inc. -Bonser Gravel Pit <br />Exhibit D -Mining Plan <br />Bacltground and Procedure <br />The proposed Bonser pit will be developed on land owned by the operator-Coulson Excavating Co, Inc of <br />Loveland, CO. The permit area will cover approximately 90 acres and the pit areas will cover a total of <br />approximately 64.8 acres. The aggregate to be removed is classified as a Class A aggregate resource by <br />the US Geological survey. The method of mining is to be dry mining, and a backhce will be the primary <br />extraction equipment. Aggregate will be processed on site. Aggregate processing facilities are to include; <br />a crusher and screening facility, a scale house, an asphalt batch plant, and associated aggregate and fines <br />stockpiles. <br />Mining Operatioav and Timetable <br />The Bonser gravel pit is expected to be operational for approximately 20-35 years. Overburden removal <br />will begin one to three years after permitting, with gravel removal starting 30 to 60 days thereafter. The <br />crusher, screening facility and scale house will be installed prior to gravel extraction, and an asphalt plant <br />will be installed approximately six months to one year thereafter. <br />The mining plan is divided into three approximately equal sections or phases, each cell measuring <br />approximately 104,681 yd~ (21.6 acres). Extraction is expected to last between 5-10 years for each <br />celUphase. Approximately 229,109-yd3 overburden and approximately 330,948 tons of gavel will be <br />extracted from each cell (Table 1). Mining will begin at the southern boundary and move towazds the <br />north. <br />Table I <br />Phase/Cell Overburden <br />Removed Gravel Extracted Duration <br />1 _229,109 yd3 _330,948 tons -5-10 yrs. <br />2 --229,109 yd3 -330,948tons -5-10 yrs. <br />3 _229,109 yd3 -330,948 tons -5-10 yrs. <br />TOTAL -b87,327 yd3 --992,844 tons -15-30 yrs. <br />Reclamation 1-Syrs <br />Prior to aggregate extraction of each phase, overburden will be stripped with scrapers and stockpiled <br />around the perimeter as shown in Figure 1, Exhibit D. Stockpiles will be constructed 20 - 30 ft high, and <br />40 - 50 ft wide, with 0.5:1 side slopes. Remaining overburden will be stockpiled at the north end of the <br />permit area. The size and geometry of the stockpiles surrounding the perimeter of the pit have been <br />designed so there will be enough volume to backfill slopes to 2:1 and leave an earthen berm/dam of <br />approximately 10 ft high during reclamation. Reclamation is expected to commence within 1 year of the <br />completion of mining and be complete within 5 years after the completion of mining. <br />